jquery Operation checkbox

The 2012 European Cup "death group" team is:<br>

<inputtype= "checkbox" Name= "Nation" value= "Germany" > Germany

<inputtype= "checkbox" Name= "Nation" value= "Denmark" > Denmark

<inputtype= "checkbox" Name= "Nation" value= "Holland" > Netherlands

<inputtype= "checkbox" Name= "Nation" value= "Portugal" > Portugal

1, the first and second team to qualify, so to limit only two items to be selected.

var len = $ ("Input[name= ' Nation ']:checked"). Length;

if (len==0) {

Alert ("Please select the national team!") ");

return false;

}

else if (len<2) {

Alert ("Please select two national teams!") ");

return false;

}

else if (len>2) {

Alert ("Only choose two national teams!") ");

return false;

}

else{

return true;

}

　　

2. Traverse the selected national team.

$ ("Input[name= ' Nation ']:checked"). each (function () {

Alert ("Selected national team:" +$ (This). Val ());

});

3. Cancel all selected national teams.

$ ("Input[name= ' Nation ']:checked"). attr ("checked", false);

　　

4, the designated two national teams selected.

$ ("Input[name= ' Nation '][value= ' Germany ']"). attr ("Checked", true);

$ ("Input[name= ' Nation '][value= ' Holland ']"). attr ("Checked", true);

　　

5. Prohibit the selection of national team.

$ ("Input[name= ' Nation ')"). attr ("Disabled", true);

　　

6. Allow the selection of national teams.

$ ("Input[name= ' Nation ')"). attr ("disabled", false);

　　

7. Select the national team with an even or odd index (the index is starting from 0).

Select the national team with an even number of indexes

$ ("Input[name= ' Nation ']:even"). attr ("Checked", true);

Select the national team with the odd index

$ ("Input[name= ' Nation ']:odd"). attr ("Checked", true);

jquery Operation checkbox